There are various ways to convert an OLM file into PST format; some of them are very complicated, and some of them are easy to perform. Well, I have best OLM to PST converter that will really help you accomplish the task. To finish the procedure, they provide both free and paid options, but I would first recommend using the free methods. There are various stages to moving OLM data into PST.
You can easily test the free methods by going to: https://www.datarepairtools.com/blog/methods-to-convert-olm-to-pst-file/